src/users.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2006-2009 Robin Burchell <robin+git@viroteck.net>
   6  *   Copyright (C) 2006-2007, 2009 Dennis Friis <peavey@inspircd.org>
   7  *   Copyright (C) 2008 John Brooks <john.brooks@dereferenced.net>
   8  *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
   9  *   Copyright (C) 2008 Oliver Lupton <oliverlupton@gmail.com>
  10  *   Copyright (C) 2003-2008 Craig Edwards <craigedwards@brainbox.cc>
  11  *
  12  * This file is part of InspIRCd.  InspIRCd is free software: you can
  13  * redistribute it and/or modify it under the terms of the GNU General Public
  14  * License as published by the Free Software Foundation, version 2.
  15  *
  16  * This program is distributed in the hope that it will be useful, but WITHOUT
  17  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  18  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  19  * details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  */
  24
  25
  26 #include "inspircd.h"
  27 #include "xline.h"
  28
  29 bool User::IsNoticeMaskSet(unsigned char sm)
  30 {
  31         if (!isalpha(sm))
  32                 return false;
  33         return (snomasks[sm-65]);
  34 }
  35
  36 bool User::IsModeSet(unsigned char m)
  37 {
  38         ModeHandler* mh = ServerInstance->Modes->FindMode(m, MODETYPE_USER);
  39         return (mh && modes[mh->GetId()]);
  40 }
  41
  42 const char* User::FormatModes(bool showparameters)
  43 {
  44         static std::string data;
  45         std::string params;
  46         data.clear();
  47
  48         for (unsigned char n = 0; n < 64; n++)
  49         {
  50                 ModeHandler* mh = ServerInstance->Modes->FindMode(n + 65, MODETYPE_USER);
  51                 if (mh && IsModeSet(mh))
  52                 {
  53                         data.push_back(n + 65);
  54                         if (showparameters && mh->GetNumParams(true))
  55                         {
  56                                 std::string p = mh->GetUserParameter(this);
  57                                 if (p.length())
  58                                         params.append(" ").append(p);
  59                         }
  60                 }
  61         }
  62         data += params;
  63         return data.c_str();
  64 }
  65
  66 User::User(const std::string& uid, Server* srv, int type)
  67         : age(ServerInstance->Time())
  68         , signon(0)
  69         , uuid(uid)
  70         , server(srv)
  71         , registered(REG_NONE)
  72         , quitting(false)
  73         , usertype(type)
  74 {
  75         client_sa.sa.sa_family = AF_UNSPEC;
  76
  77         ServerInstance->Logs->Log("USERS", LOG_DEBUG, "New UUID for user: %s", uuid.c_str());
  78
  79         // Do not insert FakeUsers into the uuidlist so FindUUID() won't return them which is the desired behavior
  80         if (type != USERTYPE_SERVER)
  81         {
  82                 if (!ServerInstance->Users.uuidlist.insert(std::make_pair(uuid, this)).second)
  83                         throw CoreException("Duplicate UUID in User constructor: " + uuid);
  84         }
  85 }
  86
  87 LocalUser::LocalUser(int myfd, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* servaddr)
  88         : User(ServerInstance->UIDGen.GetUID(), ServerInstance->FakeClient->server, USERTYPE_LOCAL)
  89         , eh(this)
  90         , bytes_in(0)
  91         , bytes_out(0)
  92         , cmds_in(0)
  93         , cmds_out(0)
  94         , quitting_sendq(false)
  95         , lastping(true)
  96         , exempt(false)
  97         , nping(0)
  98         , idle_lastmsg(0)
  99         , CommandFloodPenalty(0)
 100         , already_sent(0)
 101 {
 102         signon = ServerInstance->Time();
 103         // The user's default nick is their UUID
 104         nick = uuid;
 105         ident = "unknown";
 106         eh.SetFd(myfd);
 107         memcpy(&client_sa, client, sizeof(irc::sockets::sockaddrs));
 108         memcpy(&server_sa, servaddr, sizeof(irc::sockets::sockaddrs));
 109         dhost = host = GetIPString();
 110 }
 111
 112 User::~User()
 113 {
 114 }
 115
 116 const std::string& User::MakeHost()
 117 {
 118         if (!this->cached_makehost.empty())
 119                 return this->cached_makehost;
 120
 121         // XXX: Is there really a need to cache this?
 122         this->cached_makehost = ident + "@" + host;
 123         return this->cached_makehost;
 124 }
 125
 126 const std::string& User::MakeHostIP()
 127 {
 128         if (!this->cached_hostip.empty())
 129                 return this->cached_hostip;
 130
 131         // XXX: Is there really a need to cache this?
 132         this->cached_hostip = ident + "@" + this->GetIPString();
 133         return this->cached_hostip;
 134 }
 135
 136 const std::string& User::GetFullHost()
 137 {
 138         if (!this->cached_fullhost.empty())
 139                 return this->cached_fullhost;
 140
 141         // XXX: Is there really a need to cache this?
 142         this->cached_fullhost = nick + "!" + ident + "@" + dhost;
 143         return this->cached_fullhost;
 144 }
 145
 146 const std::string& User::GetFullRealHost()
 147 {
 148         if (!this->cached_fullrealhost.empty())
 149                 return this->cached_fullrealhost;
 150
 151         // XXX: Is there really a need to cache this?
 152         this->cached_fullrealhost = nick + "!" + ident + "@" + host;
 153         return this->cached_fullrealhost;
 154 }
 155
 156 bool User::HasModePermission(unsigned char, ModeType)
 157 {
 158         return true;
 159 }
 160
 161 bool LocalUser::HasModePermission(unsigned char mode, ModeType type)
 162 {
 163         if (!this->IsOper())
 164                 return false;
 165
 166         if (mode < 'A' || mode > ('A' + 64)) return false;
 167
 168         return ((type == MODETYPE_USER ? oper->AllowedUserModes : oper->AllowedChanModes))[(mode - 'A')];
 169
 170 }
 171 /*
 172  * users on remote servers can completely bypass all permissions based checks.
 173  * This prevents desyncs when one server has different type/class tags to another.
 174  * That having been said, this does open things up to the possibility of source changes
 175  * allowing remote kills, etc - but if they have access to the src, they most likely have
 176  * access to the conf - so it's an end to a means either way.
 177  */
 178 bool User::HasPermission(const std::string&)
 179 {
 180         return true;
 181 }
 182
 183 bool LocalUser::HasPermission(const std::string &command)
 184 {
 185         // are they even an oper at all?
 186         if (!this->IsOper())
 187         {
 188                 return false;
 189         }
 190
 191         if (oper->AllowedOperCommands.find(command) != oper->AllowedOperCommands.end())
 192                 return true;
 193         else if (oper->AllowedOperCommands.find("*") != oper->AllowedOperCommands.end())
 194                 return true;
 195
 196         return false;
 197 }
 198
 199 bool User::HasPrivPermission(const std::string &privstr, bool noisy)
 200 {
 201         return true;
 202 }
 203
 204 bool LocalUser::HasPrivPermission(const std::string &privstr, bool noisy)
 205 {
 206         if (!this->IsOper())
 207         {
 208                 if (noisy)
 209                         this->WriteNotice("You are not an oper");
 210                 return false;
 211         }
 212
 213         if (oper->AllowedPrivs.find(privstr) != oper->AllowedPrivs.end())
 214         {
 215                 return true;
 216         }
 217         else if (oper->AllowedPrivs.find("*") != oper->AllowedPrivs.end())
 218         {
 219                 return true;
 220         }
 221
 222         if (noisy)
 223                 this->WriteNotice("Oper type " + oper->name + " does not have access to priv " + privstr);
 224
 225         return false;
 226 }
 227
 228 void UserIOHandler::OnDataReady()
 229 {
 230         if (user->quitting)
 231                 return;
 232
 233         if (recvq.length() > user->MyClass->GetRecvqMax() && !user->HasPrivPermission("users/flood/increased-buffers"))
 234         {
 235                 ServerInstance->Users->QuitUser(user, "RecvQ exceeded");
 236                 ServerInstance->SNO->WriteToSnoMask('a', "User %s RecvQ of %lu exceeds connect class maximum of %lu",
 237                         user->nick.c_str(), (unsigned long)recvq.length(), user->MyClass->GetRecvqMax());
 238                 return;
 239         }
 240         unsigned long sendqmax = ULONG_MAX;
 241         if (!user->HasPrivPermission("users/flood/increased-buffers"))
 242                 sendqmax = user->MyClass->GetSendqSoftMax();
 243         unsigned long penaltymax = ULONG_MAX;
 244         if (!user->HasPrivPermission("users/flood/no-fakelag"))
 245                 penaltymax = user->MyClass->GetPenaltyThreshold() * 1000;
 246
 247         while (user->CommandFloodPenalty < penaltymax && getSendQSize() < sendqmax)
 248         {
 249                 std::string line;
 250                 line.reserve(ServerInstance->Config->Limits.MaxLine);
 251                 std::string::size_type qpos = 0;
 252                 while (qpos < recvq.length())
 253                 {
 254                         char c = recvq[qpos++];
 255                         switch (c)
 256                         {
 257                         case '\0':
 258                                 c = ' ';
 259                                 break;
 260                         case '\r':
 261                                 continue;
 262                         case '\n':
 263                                 goto eol_found;
 264                         }
 265                         if (line.length() < ServerInstance->Config->Limits.MaxLine - 2)
 266                                 line.push_back(c);
 267                 }
 268                 // if we got here, the recvq ran out before we found a newline
 269                 return;
 270 eol_found:
 271                 // just found a newline. Terminate the string, and pull it out of recvq
 272                 recvq.erase(0, qpos);
 273
 274                 // TODO should this be moved to when it was inserted in recvq?
 275                 ServerInstance->stats.Recv += qpos;
 276                 user->bytes_in += qpos;
 277                 user->cmds_in++;
 278
 279                 ServerInstance->Parser.ProcessBuffer(line, user);
 280                 if (user->quitting)
 281                         return;
 282         }
 283         if (user->CommandFloodPenalty >= penaltymax && !user->MyClass->fakelag)
 284                 ServerInstance->Users->QuitUser(user, "Excess Flood");
 285 }
 286
 287 void UserIOHandler::AddWriteBuf(const std::string &data)
 288 {
 289         if (user->quitting_sendq)
 290                 return;
 291         if (!user->quitting && getSendQSize() + data.length() > user->MyClass->GetSendqHardMax() &&
 292                 !user->HasPrivPermission("users/flood/increased-buffers"))
 293         {
 294                 user->quitting_sendq = true;
 295                 ServerInstance->GlobalCulls.AddSQItem(user);
 296                 return;
 297         }
 298
 299         // We still want to append data to the sendq of a quitting user,
 300         // e.g. their ERROR message that says 'closing link'
 301
 302         WriteData(data);
 303 }
 304
 305 void UserIOHandler::OnError(BufferedSocketError)
 306 {
 307         ServerInstance->Users->QuitUser(user, getError());
 308 }
 309
 310 CullResult User::cull()
 311 {
 312         if (!quitting)
 313                 ServerInstance->Users->QuitUser(this, "Culled without QuitUser");
 314
 315         if (client_sa.sa.sa_family != AF_UNSPEC)
 316                 ServerInstance->Users->RemoveCloneCounts(this);
 317
 318         return Extensible::cull();
 319 }
 320
 321 CullResult LocalUser::cull()
 322 {
 323         eh.cull();
 324         return User::cull();
 325 }
 326
 327 CullResult FakeUser::cull()
 328 {
 329         // Fake users don't quit, they just get culled.
 330         quitting = true;
 331         // Fake users are not inserted into UserManager::clientlist or uuidlist, so we don't need to modify those here
 332         return User::cull();
 333 }
 334
 335 void User::Oper(OperInfo* info)
 336 {
 337         ModeHandler* opermh = ServerInstance->Modes->FindMode('o', MODETYPE_USER);
 338         if (this->IsModeSet(opermh))
 339                 this->UnOper();
 340
 341         this->SetMode(opermh, true);
 342         this->oper = info;
 343         this->WriteCommand("MODE", "+o");
 344         FOREACH_MOD(OnOper, (this, info->name));
 345
 346         std::string opername;
 347         if (info->oper_block)
 348                 opername = info->oper_block->getString("name");
 349
 350         if (IS_LOCAL(this))
 351         {
 352                 LocalUser* l = IS_LOCAL(this);
 353                 std::string vhost = oper->getConfig("vhost");
 354                 if (!vhost.empty())
 355                         l->ChangeDisplayedHost(vhost);
 356                 std::string opClass = oper->getConfig("class");
 357                 if (!opClass.empty())
 358                         l->SetClass(opClass);
 359         }
 360
 361         ServerInstance->SNO->WriteToSnoMask('o',"%s (%s@%s) is now an IRC operator of type %s (using oper '%s')",
 362                 nick.c_str(), ident.c_str(), host.c_str(), oper->name.c_str(), opername.c_str());
 363         this->WriteNumeric(RPL_YOUAREOPER, InspIRCd::Format("You are now %s %s", strchr("aeiouAEIOU", oper->name[0]) ? "an" : "a", oper->name.c_str()));
 364
 365         ServerInstance->Logs->Log("OPER", LOG_DEFAULT, "%s opered as type: %s", GetFullRealHost().c_str(), oper->name.c_str());
 366         ServerInstance->Users->all_opers.push_back(this);
 367
 368         // Expand permissions from config for faster lookup
 369         if (IS_LOCAL(this))
 370                 oper->init();
 371
 372         FOREACH_MOD(OnPostOper, (this, oper->name, opername));
 373 }
 374
 375 void OperInfo::init()
 376 {
 377         AllowedOperCommands.clear();
 378         AllowedPrivs.clear();
 379         AllowedUserModes.reset();
 380         AllowedChanModes.reset();
 381         AllowedUserModes['o' - 'A'] = true; // Call me paranoid if you want.
 382
 383         for(std::vector<reference<ConfigTag> >::iterator iter = class_blocks.begin(); iter != class_blocks.end(); ++iter)
 384         {
 385                 ConfigTag* tag = *iter;
 386                 std::string mycmd, mypriv;
 387                 /* Process commands */
 388                 irc::spacesepstream CommandList(tag->getString("commands"));
 389                 while (CommandList.GetToken(mycmd))
 390                 {
 391                         AllowedOperCommands.insert(mycmd);
 392                 }
 393
 394                 irc::spacesepstream PrivList(tag->getString("privs"));
 395                 while (PrivList.GetToken(mypriv))
 396                 {
 397                         AllowedPrivs.insert(mypriv);
 398                 }
 399
 400                 std::string modes = tag->getString("usermodes");
 401                 for (std::string::const_iterator c = modes.begin(); c != modes.end(); ++c)
 402                 {
 403                         if (*c == '*')
 404                         {
 405                                 this->AllowedUserModes.set();
 406                         }
 407                         else if (*c >= 'A' && *c <= 'z')
 408                         {
 409                                 this->AllowedUserModes[*c - 'A'] = true;
 410                         }
 411                 }
 412
 413                 modes = tag->getString("chanmodes");
 414                 for (std::string::const_iterator c = modes.begin(); c != modes.end(); ++c)
 415                 {
 416                         if (*c == '*')
 417                         {
 418                                 this->AllowedChanModes.set();
 419                         }
 420                         else if (*c >= 'A' && *c <= 'z')
 421                         {
 422                                 this->AllowedChanModes[*c - 'A'] = true;
 423                         }
 424                 }
 425         }
 426 }
 427
 428 void User::UnOper()
 429 {
 430         if (!this->IsOper())
 431                 return;
 432
 433         /*
 434          * unset their oper type (what IS_OPER checks).
 435          * note, order is important - this must come before modes as -o attempts
 436          * to call UnOper. -- w00t
 437          */
 438         oper = NULL;
 439
 440
 441         /* Remove all oper only modes from the user when the deoper - Bug #466*/
 442         Modes::ChangeList changelist;
 443         const ModeParser::ModeHandlerMap& usermodes = ServerInstance->Modes->GetModes(MODETYPE_USER);
 444         for (ModeParser::ModeHandlerMap::const_iterator i = usermodes.begin(); i != usermodes.end(); ++i)
 445         {
 446                 ModeHandler* mh = i->second;
 447                 if (mh->NeedsOper())
 448                         changelist.push_remove(mh);
 449         }
 450
 451         ServerInstance->Modes->Process(this, NULL, this, changelist);
 452
 453         // Remove the user from the oper list
 454         stdalgo::vector::swaperase(ServerInstance->Users->all_opers, this);
 455
 456         ModeHandler* opermh = ServerInstance->Modes->FindMode('o', MODETYPE_USER);
 457         this->SetMode(opermh, false);
 458 }
 459
 460 /*
 461  * Check class restrictions
 462  */
 463 void LocalUser::CheckClass(bool clone_count)
 464 {
 465         ConnectClass* a = this->MyClass;
 466
 467         if (!a)
 468         {
 469                 ServerInstance->Users->QuitUser(this, "Access denied by configuration");
 470                 return;
 471         }
 472         else if (a->type == CC_DENY)
 473         {
 474                 ServerInstance->Users->QuitUser(this, a->config->getString("reason", "Unauthorised connection"));
 475                 return;
 476         }
 477         else if (clone_count)
 478         {
 479                 const UserManager::CloneCounts& clonecounts = ServerInstance->Users->GetCloneCounts(this);
 480                 if ((a->GetMaxLocal()) && (clonecounts.local > a->GetMaxLocal()))
 481                 {
 482                         ServerInstance->Users->QuitUser(this, "No more connections allowed from your host via this connect class (local)");
 483                         if (a->maxconnwarn)
 484                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: maximum LOCAL connections (%ld) exceeded for IP %s", a->GetMaxLocal(), this->GetIPString().c_str());
 485                         return;
 486                 }
 487                 else if ((a->GetMaxGlobal()) && (clonecounts.global > a->GetMaxGlobal()))
 488                 {
 489                         ServerInstance->Users->QuitUser(this, "No more connections allowed from your host via this connect class (global)");
 490                         if (a->maxconnwarn)
 491                                 ServerInstance->SNO->WriteToSnoMask('a', "WARNING: maximum GLOBAL connections (%ld) exceeded for IP %s", a->GetMaxGlobal(), this->GetIPString().c_str());
 492                         return;
 493                 }
 494         }
 495
 496         this->nping = ServerInstance->Time() + a->GetPingTime() + ServerInstance->Config->dns_timeout;
 497 }
 498
 499 bool LocalUser::CheckLines(bool doZline)
 500 {
 501         const char* check[] = { "G" , "K", (doZline) ? "Z" : NULL, NULL };
 502
 503         if (!this->exempt)
 504         {
 505                 for (int n = 0; check[n]; ++n)
 506                 {
 507                         XLine *r = ServerInstance->XLines->MatchesLine(check[n], this);
 508
 509                         if (r)
 510                         {
 511                                 r->Apply(this);
 512                                 return true;
 513                         }
 514                 }
 515         }
 516
 517         return false;
 518 }
 519
 520 void LocalUser::FullConnect()
 521 {
 522         ServerInstance->stats.Connects++;
 523         this->idle_lastmsg = ServerInstance->Time();
 524
 525         /*
 526          * You may be thinking "wtf, we checked this in User::AddClient!" - and yes, we did, BUT.
 527          * At the time AddClient is called, we don't have a resolved host, by here we probably do - which
 528          * may put the user into a totally seperate class with different restrictions! so we *must* check again.
 529          * Don't remove this! -- w00t
 530          */
 531         MyClass = NULL;
 532         SetClass();
 533         CheckClass();
 534         CheckLines();
 535
 536         if (quitting)
 537                 return;
 538
 539         this->WriteNumeric(RPL_WELCOME, InspIRCd::Format("Welcome to the %s IRC Network %s", ServerInstance->Config->Network.c_str(), GetFullRealHost().c_str()));
 540         this->WriteNumeric(RPL_YOURHOSTIS, InspIRCd::Format("Your host is %s, running version %s", ServerInstance->Config->ServerName.c_str(), INSPIRCD_BRANCH));
 541         this->WriteNumeric(RPL_SERVERCREATED, InspIRCd::Format("This server was created %s %s", __TIME__, __DATE__));
 542
 543         const std::string& modelist = ServerInstance->Modes->GetModeListFor004Numeric();
 544         this->WriteNumeric(RPL_SERVERVERSION, ServerInstance->Config->ServerName, INSPIRCD_BRANCH, modelist);
 545
 546         ServerInstance->ISupport.SendTo(this);
 547
 548         /* Now registered */
 549         if (ServerInstance->Users->unregistered_count)
 550                 ServerInstance->Users->unregistered_count--;
 551
 552         /* Trigger MOTD and LUSERS output, give modules a chance too */
 553         ModResult MOD_RESULT;
 554         std::string command("LUSERS");
 555         std::vector<std::string> parameters;
 556         FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, parameters, this, true, command));
 557         if (!MOD_RESULT)
 558                 ServerInstance->Parser.CallHandler(command, parameters, this);
 559
 560         MOD_RESULT = MOD_RES_PASSTHRU;
 561         command = "MOTD";
 562         FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, parameters, this, true, command));
 563         if (!MOD_RESULT)
 564                 ServerInstance->Parser.CallHandler(command, parameters, this);
 565
 566         if (ServerInstance->Config->RawLog)
 567                 WriteServ("PRIVMSG %s :*** Raw I/O logging is enabled on this server. All messages, passwords, and commands are being recorded.", nick.c_str());
 568
 569         /*
 570          * We don't set REG_ALL until triggering OnUserConnect, so some module events don't spew out stuff
 571          * for a user that doesn't exist yet.
 572          */
 573         FOREACH_MOD(OnUserConnect, (this));
 574
 575         this->registered = REG_ALL;
 576
 577         FOREACH_MOD(OnPostConnect, (this));
 578
 579         ServerInstance->SNO->WriteToSnoMask('c',"Client connecting on port %d (class %s): %s (%s) [%s]",
 580                 this->GetServerPort(), this->MyClass->name.c_str(), GetFullRealHost().c_str(), this->GetIPString().c_str(), this->fullname.c_str());
 581         ServerInstance->Logs->Log("BANCACHE", LOG_DEBUG, "BanCache: Adding NEGATIVE hit for " + this->GetIPString());
 582         ServerInstance->BanCache.AddHit(this->GetIPString(), "", "");
 583         // reset the flood penalty (which could have been raised due to things like auto +x)
 584         CommandFloodPenalty = 0;
 585 }
 586
 587 void User::InvalidateCache()
 588 {
 589         /* Invalidate cache */
 590         cached_fullhost.clear();
 591         cached_hostip.clear();
 592         cached_makehost.clear();
 593         cached_fullrealhost.clear();
 594 }
 595
 596 bool User::ChangeNick(const std::string& newnick, time_t newts)
 597 {
 598         if (quitting)
 599         {
 600                 ServerInstance->Logs->Log("USERS", LOG_DEFAULT, "ERROR: Attempted to change nick of a quitting user: " + this->nick);
 601                 return false;
 602         }
 603
 604         User* const InUse = ServerInstance->FindNickOnly(newnick);
 605         if (InUse == this)
 606         {
 607                 // case change, don't need to check campers
 608                 // and, if it's identical including case, we can leave right now
 609                 // We also don't update the nick TS if it's a case change, either
 610                 if (newnick == nick)
 611                         return true;
 612         }
 613         else
 614         {
 615                 /*
 616                  * Uh oh.. if the nickname is in use, and it's not in use by the person using it (doh) --
 617                  * then we have a potential collide. Check whether someone else is camping on the nick
 618                  * (i.e. connect -> send NICK, don't send USER.) If they are camping, force-change the
 619                  * camper to their UID, and allow the incoming nick change.
 620                  *
 621                  * If the guy using the nick is already using it, tell the incoming nick change to gtfo,
 622                  * because the nick is already (rightfully) in use. -- w00t
 623                  */
 624                 if (InUse)
 625                 {
 626                         if (InUse->registered != REG_ALL)
 627                         {
 628                                 /* force the camper to their UUID, and ask them to re-send a NICK. */
 629                                 InUse->WriteFrom(InUse, "NICK %s", InUse->uuid.c_str());
 630                                 InUse->WriteNumeric(ERR_NICKNAMEINUSE, InUse->nick, "Nickname overruled.");
 631
 632                                 InUse->registered &= ~REG_NICK;
 633                                 InUse->ChangeNick(InUse->uuid);
 634                         }
 635                         else
 636                         {
 637                                 /* No camping, tell the incoming user  to stop trying to change nick ;p */
 638                                 this->WriteNumeric(ERR_NICKNAMEINUSE, newnick, "Nickname is already in use.");
 639                                 return false;
 640                         }
 641                 }
 642
 643                 age = newts ? newts : ServerInstance->Time();
 644         }
 645
 646         if (this->registered == REG_ALL)
 647                 this->WriteCommon("NICK %s",newnick.c_str());
 648         std::string oldnick = nick;
 649         nick = newnick;
 650
 651         InvalidateCache();
 652         ServerInstance->Users->clientlist.erase(oldnick);
 653         ServerInstance->Users->clientlist[newnick] = this;
 654
 655         if (registered == REG_ALL)
 656                 FOREACH_MOD(OnUserPostNick, (this,oldnick));
 657
 658         return true;
 659 }
 660
 661 int LocalUser::GetServerPort()
 662 {
 663         switch (this->server_sa.sa.sa_family)
 664         {
 665                 case AF_INET6:
 666                         return htons(this->server_sa.in6.sin6_port);
 667                 case AF_INET:
 668                         return htons(this->server_sa.in4.sin_port);
 669         }
 670         return 0;
 671 }
 672
 673 const std::string& User::GetIPString()
 674 {
 675         int port;
 676         if (cachedip.empty())
 677         {
 678                 irc::sockets::satoap(client_sa, cachedip, port);
 679                 /* IP addresses starting with a : on irc are a Bad Thing (tm) */
 680                 if (cachedip[0] == ':')
 681                         cachedip.insert(cachedip.begin(),1,'0');
 682         }
 683
 684         return cachedip;
 685 }
 686
 687 irc::sockets::cidr_mask User::GetCIDRMask()
 688 {
 689         int range = 0;
 690         switch (client_sa.sa.sa_family)
 691         {
 692                 case AF_INET6:
 693                         range = ServerInstance->Config->c_ipv6_range;
 694                         break;
 695                 case AF_INET:
 696                         range = ServerInstance->Config->c_ipv4_range;
 697                         break;
 698         }
 699         return irc::sockets::cidr_mask(client_sa, range);
 700 }
 701
 702 bool User::SetClientIP(const char* sip, bool recheck_eline)
 703 {
 704         cachedip.clear();
 705         cached_hostip.clear();
 706         return irc::sockets::aptosa(sip, 0, client_sa);
 707 }
 708
 709 void User::SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline)
 710 {
 711         cachedip.clear();
 712         cached_hostip.clear();
 713         memcpy(&client_sa, &sa, sizeof(irc::sockets::sockaddrs));
 714 }
 715
 716 bool LocalUser::SetClientIP(const char* sip, bool recheck_eline)
 717 {
 718         irc::sockets::sockaddrs sa;
 719         if (!irc::sockets::aptosa(sip, 0, sa))
 720                 // Invalid
 721                 return false;
 722
 723         LocalUser::SetClientIP(sa, recheck_eline);
 724         return true;
 725 }
 726
 727 void LocalUser::SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline)
 728 {
 729         if (sa != client_sa)
 730         {
 731                 User::SetClientIP(sa);
 732                 if (recheck_eline)
 733                         this->exempt = (ServerInstance->XLines->MatchesLine("E", this) != NULL);
 734
 735                 FOREACH_MOD(OnSetUserIP, (this));
 736         }
 737 }
 738
 739 static std::string wide_newline("\r\n");
 740
 741 void User::Write(const std::string& text)
 742 {
 743 }
 744
 745 void User::Write(const char *text, ...)
 746 {
 747 }
 748
 749 void LocalUser::Write(const std::string& text)
 750 {
 751         if (!SocketEngine::BoundsCheckFd(&eh))
 752                 return;
 753
 754         if (text.length() > ServerInstance->Config->Limits.MaxLine - 2)
 755         {
 756                 // this should happen rarely or never. Crop the string at 512 and try again.
 757                 std::string try_again(text, 0, ServerInstance->Config->Limits.MaxLine - 2);
 758                 Write(try_again);
 759                 return;
 760         }
 761
 762         ServerInstance->Logs->Log("USEROUTPUT", LOG_RAWIO, "C[%s] O %s", uuid.c_str(), text.c_str());
 763
 764         eh.AddWriteBuf(text);
 765         eh.AddWriteBuf(wide_newline);
 766
 767         ServerInstance->stats.Sent += text.length() + 2;
 768         this->bytes_out += text.length() + 2;
 769         this->cmds_out++;
 770 }
 771
 772 /** Write()
 773  */
 774 void LocalUser::Write(const char *text, ...)
 775 {
 776         std::string textbuffer;
 777         VAFORMAT(textbuffer, text, text);
 778         this->Write(textbuffer);
 779 }
 780
 781 void User::WriteServ(const std::string& text)
 782 {
 783         this->Write(":%s %s",ServerInstance->Config->ServerName.c_str(),text.c_str());
 784 }
 785
 786 /** WriteServ()
 787  *  Same as Write(), except `text' is prefixed with `:server.name '.
 788  */
 789 void User::WriteServ(const char* text, ...)
 790 {
 791         std::string textbuffer;
 792         VAFORMAT(textbuffer, text, text);
 793         this->WriteServ(textbuffer);
 794 }
 795
 796 void User::WriteCommand(const char* command, const std::string& text)
 797 {
 798         this->WriteServ(command + (this->registered & REG_NICK ? " " + this->nick : " *") + " " + text);
 799 }
 800
 801 namespace
 802 {
 803         std::string BuildNumeric(const std::string& source, User* targetuser, unsigned int num, const std::vector<std::string>& params)
 804         {
 805                 const char* const target = (targetuser->registered & REG_NICK ? targetuser->nick.c_str() : "*");
 806                 std::string raw = InspIRCd::Format(":%s %03u %s", source.c_str(), num, target);
 807                 if (!params.empty())
 808                 {
 809                         for (std::vector<std::string>::const_iterator i = params.begin(); i != params.end()-1; ++i)
 810                                 raw.append(1, ' ').append(*i);
 811                         raw.append(" :").append(params.back());
 812                 }
 813                 return raw;
 814         }
 815 }
 816
 817 void User::WriteNumeric(const Numeric::Numeric& numeric)
 818 {
 819         ModResult MOD_RESULT;
 820
 821         FIRST_MOD_RESULT(OnNumeric, MOD_RESULT, (this, numeric));
 822
 823         if (MOD_RESULT == MOD_RES_DENY)
 824                 return;
 825
 826         const std::string& servername = (numeric.GetServer() ? numeric.GetServer()->GetName() : ServerInstance->Config->ServerName);
 827         this->Write(BuildNumeric(servername, this, numeric.GetNumeric(), numeric.GetParams()));
 828 }
 829
 830 void User::WriteFrom(User *user, const std::string &text)
 831 {
 832         const std::string message = ":" + user->GetFullHost() + " " + text;
 833         this->Write(message);
 834 }
 835
 836
 837 /* write text from an originating user to originating user */
 838
 839 void User::WriteFrom(User *user, const char* text, ...)
 840 {
 841         std::string textbuffer;
 842         VAFORMAT(textbuffer, text, text);
 843         this->WriteFrom(user, textbuffer);
 844 }
 845
 846 void User::WriteRemoteNotice(const std::string& text)
 847 {
 848         ServerInstance->PI->SendUserNotice(this, text);
 849 }
 850
 851 void LocalUser::WriteRemoteNotice(const std::string& text)
 852 {
 853         WriteNotice(text);
 854 }
 855
 856 namespace
 857 {
 858         class WriteCommonRawHandler : public User::ForEachNeighborHandler
 859         {
 860                 const std::string& msg;
 861
 862                 void Execute(LocalUser* user) CXX11_OVERRIDE
 863                 {
 864                         user->Write(msg);
 865                 }
 866
 867          public:
 868                 WriteCommonRawHandler(const std::string& message)
 869                         : msg(message)
 870                 {
 871                 }
 872         };
 873 }
 874
 875 void User::WriteCommon(const char* text, ...)
 876 {
 877         std::string textbuffer;
 878         VAFORMAT(textbuffer, text, text);
 879         textbuffer = ":" + this->GetFullHost() + " " + textbuffer;
 880         this->WriteCommonRaw(textbuffer, true);
 881 }
 882
 883 void User::WriteCommonRaw(const std::string &line, bool include_self)
 884 {
 885         WriteCommonRawHandler handler(line);
 886         ForEachNeighbor(handler, include_self);
 887 }
 888
 889 void User::ForEachNeighbor(ForEachNeighborHandler& handler, bool include_self)
 890 {
 891         // The basic logic for visiting the neighbors of a user is to iterate the channel list of the user
 892         // and visit all users on those channels. Because two users may share more than one common channel,
 893         // we must skip users that we have already visited.
 894         // To do this, we make use of a global counter and an integral 'already_sent' field in LocalUser.
 895         // The global counter is incremented every time we do something for each neighbor of a user. Then,
 896         // before visiting a member we examine user->already_sent. If it's equal to the current counter, we
 897         // skip the member. Otherwise, we set it to the current counter and visit the member.
 898
 899         // Ask modules to build a list of exceptions.
 900         // Mods may also exclude entire channels by erasing them from include_chans.
 901         IncludeChanList include_chans(chans.begin(), chans.end());
 902         std::map<User*, bool> exceptions;
 903         exceptions[this] = include_self;
 904         FOREACH_MOD(OnBuildNeighborList, (this, include_chans, exceptions));
 905
 906         // Get next id, guaranteed to differ from the already_sent field of all users
 907         const already_sent_t newid = ServerInstance->Users.NextAlreadySentId();
 908
 909         // Handle exceptions first
 910         for (std::map<User*, bool>::const_iterator i = exceptions.begin(); i != exceptions.end(); ++i)
 911         {
 912                 LocalUser* curr = IS_LOCAL(i->first);
 913                 if (curr)
 914                 {
 915                         // Mark as visited to ensure we won't visit again if there is a common channel
 916                         curr->already_sent = newid;
 917                         // Always treat quitting users as excluded
 918                         if ((i->second) && (!curr->quitting))
 919                                 handler.Execute(curr);
 920                 }
 921         }
 922
 923         // Now consider the real neighbors
 924         for (IncludeChanList::const_iterator i = include_chans.begin(); i != include_chans.end(); ++i)
 925         {
 926                 Channel* chan = (*i)->chan;
 927                 const Channel::MemberMap& userlist = chan->GetUsers();
 928                 for (Channel::MemberMap::const_iterator j = userlist.begin(); j != userlist.end(); ++j)
 929                 {
 930                         LocalUser* curr = IS_LOCAL(j->first);
 931                         // User not yet visited?
 932                         if ((curr) && (curr->already_sent != newid))
 933                         {
 934                                 // Mark as visited and execute function
 935                                 curr->already_sent = newid;
 936                                 handler.Execute(curr);
 937                         }
 938                 }
 939         }
 940 }
 941
 942 void User::WriteRemoteNumeric(const Numeric::Numeric& numeric)
 943 {
 944         WriteNumeric(numeric);
 945 }
 946
 947 /* return 0 or 1 depending if users u and u2 share one or more common channels
 948  * (used by QUIT, NICK etc which arent channel specific notices)
 949  *
 950  * The old algorithm in 1.0 for this was relatively inefficient, iterating over
 951  * the first users channels then the second users channels within the outer loop,
 952  * therefore it was a maximum of x*y iterations (upon returning 0 and checking
 953  * all possible iterations). However this new function instead checks against the
 954  * channel's userlist in the inner loop which is a std::map<User*,User*>
 955  * and saves us time as we already know what pointer value we are after.
 956  * Don't quote me on the maths as i am not a mathematician or computer scientist,
 957  * but i believe this algorithm is now x+(log y) maximum iterations instead.
 958  */
 959 bool User::SharesChannelWith(User *other)
 960 {
 961         /* Outer loop */
 962         for (User::ChanList::iterator i = this->chans.begin(); i != this->chans.end(); ++i)
 963         {
 964                 /* Eliminate the inner loop (which used to be ~equal in size to the outer loop)
 965                  * by replacing it with a map::find which *should* be more efficient
 966                  */
 967                 if ((*i)->chan->HasUser(other))
 968                         return true;
 969         }
 970         return false;
 971 }
 972
 973 bool User::ChangeName(const std::string& gecos)
 974 {
 975         if (!this->fullname.compare(gecos))
 976                 return true;
 977
 978         if (IS_LOCAL(this))
 979         {
 980                 ModResult MOD_RESULT;
 981                 FIRST_MOD_RESULT(OnChangeLocalUserGECOS, MOD_RESULT, (IS_LOCAL(this),gecos));
 982                 if (MOD_RESULT == MOD_RES_DENY)
 983                         return false;
 984                 FOREACH_MOD(OnChangeName, (this,gecos));
 985         }
 986         this->fullname.assign(gecos, 0, ServerInstance->Config->Limits.MaxGecos);
 987
 988         return true;
 989 }
 990
 991 bool User::ChangeDisplayedHost(const std::string& shost)
 992 {
 993         if (dhost == shost)
 994                 return true;
 995
 996         if (IS_LOCAL(this))
 997         {
 998                 ModResult MOD_RESULT;
 999                 FIRST_MOD_RESULT(OnChangeLocalUserHost, MOD_RESULT, (IS_LOCAL(this),shost));
1000                 if (MOD_RESULT == MOD_RES_DENY)
1001                         return false;
1002         }
1003
1004         FOREACH_MOD(OnChangeHost, (this,shost));
1005
1006         this->dhost.assign(shost, 0, ServerInstance->Config->Limits.MaxHost);
1007         this->InvalidateCache();
1008
1009         if (IS_LOCAL(this))
1010                 this->WriteNumeric(RPL_YOURDISPLAYEDHOST, this->dhost, "is now your displayed host");
1011
1012         return true;
1013 }
1014
1015 bool User::ChangeIdent(const std::string& newident)
1016 {
1017         if (this->ident == newident)
1018                 return true;
1019
1020         FOREACH_MOD(OnChangeIdent, (this,newident));
1021
1022         this->ident.assign(newident, 0, ServerInstance->Config->Limits.IdentMax);
1023         this->InvalidateCache();
1024
1025         return true;
1026 }
1027
1028 /*
1029  * Sets a user's connection class.
1030  * If the class name is provided, it will be used. Otherwise, the class will be guessed using host/ip/ident/etc.
1031  * NOTE: If the <ALLOW> or <DENY> tag specifies an ip, and this user resolves,
1032  * then their ip will be taken as 'priority' anyway, so for example,
1033  * <connect allow="127.0.0.1"> will match joe!bloggs@localhost
1034  */
1035 void LocalUser::SetClass(const std::string &explicit_name)
1036 {
1037         ConnectClass *found = NULL;
1038
1039         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Setting connect class for UID %s", this->uuid.c_str());
1040
1041         if (!explicit_name.empty())
1042         {
1043                 for (ServerConfig::ClassVector::const_iterator i = ServerInstance->Config->Classes.begin(); i != ServerInstance->Config->Classes.end(); ++i)
1044                 {
1045                         ConnectClass* c = *i;
1046
1047                         if (explicit_name == c->name)
1048                         {
1049                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Explicitly set to %s", explicit_name.c_str());
1050                                 found = c;
1051                         }
1052                 }
1053         }
1054         else
1055         {
1056                 for (ServerConfig::ClassVector::const_iterator i = ServerInstance->Config->Classes.begin(); i != ServerInstance->Config->Classes.end(); ++i)
1057                 {
1058                         ConnectClass* c = *i;
1059                         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Checking %s", c->GetName().c_str());
1060
1061                         ModResult MOD_RESULT;
1062                         FIRST_MOD_RESULT(OnSetConnectClass, MOD_RESULT, (this,c));
1063                         if (MOD_RESULT == MOD_RES_DENY)
1064                                 continue;
1065                         if (MOD_RESULT == MOD_RES_ALLOW)
1066                         {
1067                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Class forced by module to %s", c->GetName().c_str());
1068                                 found = c;
1069                                 break;
1070                         }
1071
1072                         if (c->type == CC_NAMED)
1073                                 continue;
1074
1075                         bool regdone = (registered != REG_NONE);
1076                         if (c->config->getBool("registered", regdone) != regdone)
1077                                 continue;
1078
1079                         /* check if host matches.. */
1080                         if (!InspIRCd::MatchCIDR(this->GetIPString(), c->GetHost(), NULL) &&
1081                             !InspIRCd::MatchCIDR(this->host, c->GetHost(), NULL))
1082                         {
1083                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "No host match (for %s)", c->GetHost().c_str());
1084                                 continue;
1085                         }
1086
1087                         /*
1088                          * deny change if change will take class over the limit check it HERE, not after we found a matching class,
1089                          * because we should attempt to find another class if this one doesn't match us. -- w00t
1090                          */
1091                         if (c->limit && (c->GetReferenceCount() >= c->limit))
1092                         {
1093                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "OOPS: Connect class limit (%lu) hit, denying", c->limit);
1094                                 continue;
1095                         }
1096
1097                         /* if it requires a port ... */
1098                         int port = c->config->getInt("port");
1099                         if (port)
1100                         {
1101                                 ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Requires port (%d)", port);
1102
1103                                 /* and our port doesn't match, fail. */
1104                                 if (this->GetServerPort() != port)
1105                                         continue;
1106                         }
1107
1108                         if (regdone && !c->config->getString("password").empty())
1109                         {
1110                                 if (!ServerInstance->PassCompare(this, c->config->getString("password"), password, c->config->getString("hash")))
1111                                 {
1112                                         ServerInstance->Logs->Log("CONNECTCLASS", LOG_DEBUG, "Bad password, skipping");
1113                                         continue;
1114                                 }
1115                         }
1116
1117                         /* we stop at the first class that meets ALL critera. */
1118                         found = c;
1119                         break;
1120                 }
1121         }
1122
1123         /*
1124          * Okay, assuming we found a class that matches.. switch us into that class, keeping refcounts up to date.
1125          */
1126         if (found)
1127         {
1128                 MyClass = found;
1129         }
1130 }
1131
1132 void User::PurgeEmptyChannels()
1133 {
1134         // firstly decrement the count on each channel
1135         for (User::ChanList::iterator i = this->chans.begin(); i != this->chans.end(); )
1136         {
1137                 Channel* c = (*i)->chan;
1138                 ++i;
1139                 c->DelUser(this);
1140         }
1141
1142         this->UnOper();
1143 }
1144
1145 const std::string& FakeUser::GetFullHost()
1146 {
1147         if (!ServerInstance->Config->HideWhoisServer.empty())
1148                 return ServerInstance->Config->HideWhoisServer;
1149         return server->GetName();
1150 }
1151
1152 const std::string& FakeUser::GetFullRealHost()
1153 {
1154         if (!ServerInstance->Config->HideWhoisServer.empty())
1155                 return ServerInstance->Config->HideWhoisServer;
1156         return server->GetName();
1157 }
1158
1159 ConnectClass::ConnectClass(ConfigTag* tag, char t, const std::string& mask)
1160         : config(tag), type(t), fakelag(true), name("unnamed"), registration_timeout(0), host(mask),
1161         pingtime(0), softsendqmax(0), hardsendqmax(0), recvqmax(0),
1162         penaltythreshold(0), commandrate(0), maxlocal(0), maxglobal(0), maxconnwarn(true), maxchans(ServerInstance->Config->MaxChans),
1163         limit(0), resolvehostnames(true)
1164 {
1165 }
1166
1167 ConnectClass::ConnectClass(ConfigTag* tag, char t, const std::string& mask, const ConnectClass& parent)
1168         : config(tag), type(t), fakelag(parent.fakelag), name("unnamed"),
1169         registration_timeout(parent.registration_timeout), host(mask), pingtime(parent.pingtime),
1170         softsendqmax(parent.softsendqmax), hardsendqmax(parent.hardsendqmax), recvqmax(parent.recvqmax),
1171         penaltythreshold(parent.penaltythreshold), commandrate(parent.commandrate),
1172         maxlocal(parent.maxlocal), maxglobal(parent.maxglobal), maxconnwarn(parent.maxconnwarn), maxchans(parent.maxchans),
1173         limit(parent.limit), resolvehostnames(parent.resolvehostnames)
1174 {
1175 }
1176
1177 void ConnectClass::Update(const ConnectClass* src)
1178 {
1179         config = src->config;
1180         type = src->type;
1181         fakelag = src->fakelag;
1182         name = src->name;
1183         registration_timeout = src->registration_timeout;
1184         host = src->host;
1185         pingtime = src->pingtime;
1186         softsendqmax = src->softsendqmax;
1187         hardsendqmax = src->hardsendqmax;
1188         recvqmax = src->recvqmax;
1189         penaltythreshold = src->penaltythreshold;
1190         commandrate = src->commandrate;
1191         maxlocal = src->maxlocal;
1192         maxglobal = src->maxglobal;
1193         maxconnwarn = src->maxconnwarn;
1194         maxchans = src->maxchans;
1195         limit = src->limit;
1196         resolvehostnames = src->resolvehostnames;
1197 }